All categories

3 years ago

Explain why the number of protons in an atom must always equal the number of electrons.

Chemistry

2 answers:

ser-zykov [4K]3 years ago

8 0

For every negative theres a positive and for every positive there is a negative

Andreyy893 years ago

4 0

Usually within an atom, the protons and electrons are equal to make the atom have a neutral charge.

However, there are cases in which the protons and electrons are different, such as Cations and Anions. Cations end up having a positive charge (less electrons than protons), and Anions end up having a negative charge (more electrons than protons).

I hope this helps!

You might be interested in

How many moles are there in 45.0 grams of sulfuric acid, H2SO4?

olga2289 [7]

Answer:

the answer is 0.4588162459

Explanation:

1 mole = 0.010195916576195

= 45 ×"

5 0

3 years ago

Consider the reactionI2(g) + Cl2(g)2ICl(g)Using standard thermodynamic data at 298K, calculate the entropy change for the surrou

Georgia [21]

We know,

$\Delta H_{I_2(g)}=62.438\ KJ/mol\\\\\Delta H_{Cl_2(g)}= 0.0\ KJ/mol\\\\\Delta H_{ICl(g)}=17.78\ KJ/mol$

For given reaction, $I_2(g)+Cl_2(g)\ -->\ 2ICl(g)$

$\Delta H_{rxn}=2\Delta H_{ICl(g)}-\Delta H_{I_2(g)}-\Delta H_{Cl_2(g)}\\\\\Delta H_{rxn}=2(17.78)-0-62.438\ KJ/mol\\\\\Delta H_{rxn}=-26.878\ KJ/mol$

For , 2.41 moles of $I_2$ :

$\Delta H_{rxn}=2.41\times (-26.878)\ KJ\\\\\Delta H_{rxn}=-64.78\ KJ$

We know :

$\Delta S = -\dfrac{\Delta H_{rxn}}{T}\\\\\Delta S = -\dfrac{-64.78}{298}\ KJ/K\\\\\Delta S =-0.21738 \ KJ/K\\\\\Delta S=-217.38\ J/K$

Hence, this is the required solution.

7 0

4 years ago

What is the weight of a 30.0 kg object? 3.0 N 300 N 6.8 N 132 N

andreyandreev [35.5K]

Explanation:

$w \: = mg \\ = 30\:kg \times 10\:ms^{-2}\\=300\:kg\:ms^{-2} \\ = 300\:N$

6 0

3 years ago

Read 2 more answers

What types of reactions are these 3 chemical equations?-

IceJOKER [234]

Answer:

*2Kl+Pb(NO3)2=PbI2+2KNO3: double replacement.

*2Al+3CuSO4=Al2(SO4)3+3Cu: single replacement.

*C2H5OH+3O2=2CO2+3H2O: combustion.

Explanation:

Hello there!

In this case, according to the required, it turns out necessary for us to recall the five types of reactions, combination, decomposition, single and double replacement and combustion as shown on the attached figure.

In such a way, since the first reaction follows the pattern AB+CD-->AD+CB we infer it is double replacement; the second reaction follows the patter A+BC-->AC+B and therefore it is single replacement; and the last one follows the pattern of combustion reaction due to the presence of CO2 and H2O on the products side.

Regards!